base: Add a type for keeping track of object file loaders.

This avoids having a big pile of #if-s in sim/process.cc and allows
dynamically adding new types of object file loaders which might
recognize new arch/OS combinations.

Change-Id: Ie3b9c1aa2974d30a61afc4fcc529ffd6a74d43e0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/18583
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/base/loader/object_file.cc b/src/base/loader/object_file.cc
index a82314e68..86278e44f 100644
--- a/src/base/loader/object_file.cc
+++ b/src/base/loader/object_file.cc
@@ -40,6 +40,7 @@
 #include <cstdio>
 #include <list>
 #include <string>
+#include <vector>
 
 #include "base/cprintf.hh"
 #include "base/loader/aout_object.hh"
@@ -97,6 +98,37 @@ ObjectFile::loadSections(PortProxy& mem_proxy, Addr addr_mask, Addr offset)
             && loadSection(&bss, mem_proxy, addr_mask, offset));
 }
 
+namespace
+{
+
+typedef std::vector<ObjectFile::Loader *> LoaderList;
+
+LoaderList &
+object_file_loaders()
+{
+    static LoaderList loaders;
+    return loaders;
+}
+
+} // anonymous namespace
+
+ObjectFile::Loader::Loader()
+{
+    object_file_loaders().emplace_back(this);
+}
+
+Process *
+ObjectFile::tryLoaders(ProcessParams *params, ObjectFile *obj_file)
+{
+    for (auto &loader: object_file_loaders()) {
+        Process *p = loader->load(params, obj_file);
+        if (p)
+            return p;
+    }
+
+    return nullptr;
+}
+
 static bool
 hasGzipMagic(int fd)
 {